Dear Mahsa,
In general it would be better to rely on a multi-subject atlas like n30r83, LPBA40, Harvard-Oxford, Neuromorphometrics, Anatomy toolbox (the latter especially useful if you're interested in cytoarchitectonic labels, at the moment available for a subset of brain regions only) and not a single-subject atlas like AAL or the Talairach-based WFU Pickatlas labels. Some of these multi-subject atlases also include probabilistic labels, which are very useful for ROI analyses.
Usually the labels refer to anatomical structures (like in the AAL, different gyri), thus the appropriate labels are likely to be called inferior parietal *gyrus* or *lobule*. Note that it is going to depend on the atlas whether this label also covers the angular gyrus and the supramarginal gyrus or whether separate labels are provided for these regions. Depending on your hypotheses you might thus have to fuse some labels or mask parts of a label.
Medial prefrontal cortex is an ill-defined term. Sometimes it refers to all the frontal medial regions, possibly also including (parts) of the ACC, sometimes there are additional constraints like excluding orbital and/or ventromedial parts (which are also defined differently by different workgroups). Thus it is going to depend on your hypotheses / the studies you rely on. The Hammers_mith n30r83 atlas might especially be useful, as it includes various frontal subregions, and depending on your hypotheses you could thus reconstruct "your own" MPFC.
As you're interested in DMN / resting state it might also be useful to go with functionally defined labels instead of anatomically based ones. There are several parcellations out there, just to mention a few:
Scanlab http://www.brainnexus.com/resources/resting-state-fmri-templates
BrainMap http://www.brainmap.org/icns/
Human Connectime Project http://www.fmrib.ox.ac.uk/analysis/TFMs/
FIND lab http://findlab.stanford.edu/functional_ROIs.html
Note that some of the resting toolboxes also include functionally defined labels.
Best
Helmut
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